Polishing brush



NOV. 1, c, F T 1,85,706

POLISHING BRUSH Filed Oct. 24, 1928 ATTORNEY.

Patented Nov. 1, 1932 UNITED STATES Aren't OFFICE CLINTON E. FROST, OF YOUNGSTOWN, OHIO ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE PITTSBURGH PLATE GLASS COMPANY, OF PITTSBURGH, -PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA POLISHING BRUSH Application filed October 24, 1928. Serial No. 314,708.

The objects of the invention are to provide an improved construction for a disc shaped polishing-wheel or brush, said brush having radially directed wires or bristles, Li] which are gathered into tufts that are looped over a central retaining'ring. The tufts are mounted between rigid sheet metal discs which provide a hub therefor and complete a unitary structure.

In practice a multiple number of these discs, according to the width of the brush required, are sleeved over a common arbor or mandrel and securely clamped thereon.

The device is an improvement upon my former Patent No. 1,683,456 granted upon Sept. 4:, 1928, for a disc shaped brush in which the discs were provided with openings of the same diameter as the arbor or mandrel, thus suiting them to all mandrels of the same di- .20 ameter. If a mandrel of smaller diameter was to be used, a reducer of the opening in at least one of the discs, was required.

In the present invention, however, one disc may be provided with a large opening which may be of stock standard size, for the reception of a large number of mandrels of different sizes. The otherdisc is provided with an opening that is reduced in size to agree with the diameter of the particular mandrel B0 to be employed therewith, thus greatly simplifying the production of the discs, since the discs having the openings of greater diameter, can be produced as a standard production, and the other discs can be formed as .35 blanks and openings can be made therein to suit the customers order, and may be made of a much smaller diameter than that of the other disc.

The several tufts of wires or bristles composing the body of the brush are composed of loops which are secured together by means of a central ring passing through the loops, in one method of construction, thus forming a unitary brush body. Each disc is attached to the body by means of integral lugs or keepers stamped therefrom. The lugs are turned at right angles and driven through the body of the brush, after which they are clinched over the bristles or wires upon the other side.

The discs are so disposed that the points of the lugs upon one disc enter the openings in the'other disc and are flattened down therein over the brush body, thus preserving a smooth, even,'external surface on both sides of the brush. This arrangement also permits' of the. attachment of'the second disc after the first one has been secured to the brush body. V

The lugs act in themanner of staples to bind all of the parts together and are inserted between the holding rim and the outer ends of the bristles. The loop method of constructing the tufts prevents the bristles from escaping singly from the brush body, and the lugs form interlocking staples to hold the discs tightly to the body. j The invention is illustrated in the.accom-' panying drawing hereinafter morefully 'desprib-ed andparticularly pointed out in the c alms.

' In the accompanying drawing 1 is a side elevation ofthe brush showing openings of dissimilar diameter in the discs; Fig.2 is a transverse central section therethrough; Fig. 3 is a transverse section on line 1'1 Fig. 1, showing the overlapping lugs; Fig. 41's aperspective of a disc having the large or standard or stock size of opening therein, and Fig." 5 is a similar perspective showing the disc having the smaller opening, which is fitted to the diameter of a particular mandrel; Fig.6 is an edge elevation of .a brush composed of flat wires. Fig. 7 is a vertical "section thereof. Fig.8 is a perspective of one looped fiat wire, and Fig. 9 is a section taken at right angles to Fig.7 showing the manner of securing the wire loops overfthe fastening lugs of the side plates.

In these views A is the body of the brush which is composed of looped tufts of wire or bristles secured radially upon a central wire ring B; G and D, are sheet metal discs 'be tween which the body of the brush is clamped and which when in position form the hub of the brush. H

' The discsare provided with central openings G and D; The disc C having a rela- "tively large opening is adapted for use with "a large'inumber of mandrels, but the discD is formed with a central opening .of such diameter as to fit exactly a particular mandrel. The center of this disc is also depressed or is offset and shouldered axially in cross section at D to reinforce the same and to form a bearing or support for the tufts of brushes, thereby preventing them from being pushed inwardly when force is applied to their outer ends. Each disc is separately attached to thebody in a rigid manner by forming pointed lugs F F, therein intermediate of its inner and outer edges, these lugs being struck from the bodies of the discs, leaving triangular openings G G therein.

The lugs in one disc are forced through the brush body between the strands thereof and the points are turned over and clinched upon the other side of the brush body. The other disc is similarly attached by means of the lugs therein which are driven through the body in the opposite direction. The last disc is so positioned that when the pointed lugs are forced through the brush body the points will enter the openings made in the first placed disc and will be clinched therein, so

that the entering lugs will pass each other as shown in Fig. 2, and the points thereof will be turned in opposite directions.

, In this manner the flat side of the discs will be smooth and capable of beingapplied closely together, as shown in'Fig. 6. The

of lesser diameter for the reception of a mandrel of a particular diameter, the marginal wall of said opening in the disc having the lesser opening being offset axially to position the edge of said lesser opening substantially in the central plane of said brush and axially spaced from the other disc.

2. In a polishing-brush, abrush body and.

discs and wires are carried in stock before assembling the parts; as shown, one disc C carries half of the tufts of wires and the other disc D carries the other half of the V tufts.

In Fig. 2 the position of the arbor or mail drel is shown in dotted lines at H and is engaged only by the inner edge of the smaller opening D which serves as a bearing therefor: Since a multiple number. of discs are pressed closely together to form an elongate sectional brush, this manner of support will be secure and rigid and the. brush can not be inclined out of the vertical plane. 7

' InFigs. 6, 7, 8 and 9the brush is shown adapted for use with flat wire, the long edges of the wires being paralleled with the longitudinal axis of the brush. I

I Here A are the wires, which are formed into points F, and secured from-being pushed in wardly by means of the shoulder D upon the ,dischD; When the discs areattached to the brush body the tufts will be immovable therein.

, Having described the invention what I claim as new and desire to securevby Letters Patent is. g

1. In a polishing brush, abody composed of looped wires and a sheet metal disc secured to each side thereof, one of said discs protufts looped over the transverse stapling viding a hub therefor, one disc being provided. withga central opening and the other disc being provided with a central opening 

